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Real-Time Online Interactive Applications (ROIA) are an increasingly important class of applications including multiplayer online computer games and simulation-based e-learning. They are usually expected to support high user numbers and thus require mechanisms to accommodate increasing load by using additional resources. This paper presents first results of the research and development project edutain@grid, including a comprehensive analysis of the application class and the new challenges regarding software development. We propose a novel, high-level development approach for ROIA which integrates three distribution mechanisms in today's online games – zoning, instancing and replication. As a first implementation of the approach, we describe the RTF (Real-Time Framework) middleware system which liberates the developer from low-level tasks and allows him to stay at high level of design abstraction. We explain how RTF supports the implementation of single and multi-server online games and how RTF incorporates various distribution mechanisms during the development process.
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